I am planning on getting REAL SOON either the Sigma Contemporary or the Tamron version of the 150-600mm lens.
I initially was thinking Sigma only, but right now Sigma is out of stock. Yes I do know Adorama (and probably other locations) has them, but I want to go to a brick and mortar store to be able to trade in my older Sigma 150-500mm lens.
I have talked to a couple Camera stores, one of the stores told me that optically they are close to being the same quality, but the Tamron has a better Image Stabilizer than Sigma has.
What are your thoughts of either of these lenses?
I know I have more questions, but right now they are not coming to my brain!
Thank you!

